Seen on eBay, a prototype of the 20th Anniversary Mac. The seller states that it does not work and comes without accessories, so the asking price ($5,900) seems a bit high to me.
Visually, it looks like the one owned by Henry Plain. A lighter model with dark speakers has already been seen on this page and on his website.
Notable details include dark speaker fabric, no markings on the front, an incomplete optical drive button, and a sticker indicating it is a prototype. However, without the subwoofer that also serves as a power supply, diagnosing the issue seems difficult, and the accessories are also missing.
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ADB
AirPort
Apple TV
Apple Watch
Bluetooth
Bêta
Clavier
Data Record
DVD
Easter Egg
Ethernet
GPU
iMac
iOS
iOS 4
iPad
iPhone
iPod
iPod touch
iTunes
Karotz
Lightning
Lion
MacBook Air
MacBook Pro
Macintosh
Mac OS
Mac OS X
Manette
Mavericks
Mountain Lion
Nabaztag
Pippin
PowerBook
Power Mac G3
Prototype
Raspberry Pi
Safari
Snow Leopard
Souris
SSD
Thunderbolt
Wi-Fi
Windows
Yosemite